Mount Everest’s summit is $8850~\text{m}$ $(29,035~\text{ft})$ above sea level. What is the barometric pressure there according to the standard atmosphere?

In writing thermochemical equations, why is it important to indicate the physical state (i.e., gaseous, liquid, solid, or aqueous) of each substance?

How much power is radiated by a tungsten sphere (emissivity $\epsilon=0.35$ ) of radius $19 \mathrm{~cm}$ at a temperature of $25^{\circ} \mathrm{C}$ ?

The density of dry air at $20\degree$C is $1.20$ g/L. What is the mass of air, in kilograms, of a room that measures $25.0$ m by $15.0$ m by $4.0$ m?

Meteor crater. About $50,000$ years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Recent ($2005$) measurements estimate that this meteor had a mass of about $1.4 \times 10^8 \mathrm{~kg}$ (around $150,000$ tons) and hit the ground at $12 \mathrm{~km} / \mathrm{s}$.
(a) How much kinetic energy did this meteor deliver to the ground?
(b) How does this energy compare to the energy produced in one day by a standard coal-fired power plant, which generates about $1$ billion joules per second?

A cube of ice is taken from the freezer at $-8.5^{\circ} \mathrm{C}$ and placed in an $85\text{-g}$ aluminum calorimeter filled with $310 \mathrm{~g}$ of water at room temperature of $20.0^{\circ} \mathrm{C}$. The final situation is all water at $17.0^{\circ} \mathrm{C}$. What was the mass of the ice cube?

Two horses pull a large crate at constant speed across a barn floor by means of two light steel cables. A large box of mass $250 \mathrm{~kg}$ sits on the crate (Figure 6-40). As the horses pull, the cables are parallel to the horizontal floor. The coefficient of friction between the crate and the barn floor is 0.25. What is the tension in each cable if the angle between each cable and the direction the crate moves is $15^{\circ}$?

How much power is radiated by a tungsten sphere (emissivity $\epsilon=0.35$ ) of radius $19 \mathrm{~cm}$ at a temperature of $25^{\circ} \mathrm{C}$ ?

A $7150 \mathrm{~kg}$ railroad car travels alone on a level frictionless track with a constant speed of $15.0 \mathrm{~m} / \mathrm{s}$. A $3350 \mathrm{~kg}$ load, initially at rest, is dropped onto the car. What will be the car's new speed?

How long does it take a $750 \mathrm{~W}$ coffeepot to bring to a boil $0.75 \mathrm{~L}$ of water initially at $11^{\circ} \mathrm{C}$ ? Assume that the part of the pot which is heated with the water is made of $280 \mathrm{~g}$ of aluminum, and that no water boils away.

(II) A roller-coaster car shown in Fig. 8-33 is pulled up to point 1 where it is released from the rest. Assuming no friction, calculate the speed at points 2, 3, and 4.

How much work is done when a vertical force acts on an object moving horizontally?

Two rooms, each a cube $4.0 \mathrm{~m}$ per side, share a $14 \mathrm{~cm}$ thick brick wall. Because of a number of $100 \mathrm{~W}$ lightbulbs in one room, the air is at $30^{\circ} \mathrm{C}$, while in the other room it is at $10^{\circ} \mathrm{C}$. How many of the $100 \mathrm{~W}$ bulbs are needed to maintain the temperature difference across the wall?

A cube of ice is taken from the freezer at $-8.5^{\circ} \mathrm{C}$ and placed in an $85 \mathrm{~g}$ aluminum calorimeter filled with $310 \mathrm{~g}$ of water at room temperature of $20.0^{\circ} \mathrm{C}$. The final situation is all water at $17.0^{\circ} \mathrm{C}$. What was the mass of the ice cube?